v6: Extend supported data types

[bevzzz]

This PR adds the following data types:

• boolean / boolean[]
• number / number[]
• date / date[]
• uuid / uuid[]
• text[]
• integer[]

Create new property types

Collection creation API allows creating properties of each of this types via a familiar API.

collection -> collection.properties(Property.boolArray("flags"), Property.textArray("tags"))

Aggregation queries

Accordingly, new aggregation metrics are available:

Aggregate.bool(m -> m.percentageFalse().totalTrue())
Aggregate.number(m -> m.min().max().mean())
Aggregate.date(m -> m.median().mode())

New date format

While working on this PR I learned that java.util.Date is considered a legacy class that has been superseded by java.time.Instant & co. as of Java 8. The new family of date formats in java.time are more versatile and flexible, which is why client6 now decodes dates into OffsetDateTime.

OffsetDateTime preserves a lot of the information from the timestamp and can be easily converted to Instant via OffsetDateTime::toInstant or Date via Date.from(instant).

New "number" format

Prior to this PR client6 used Number to represent values of the "number" properties. While technically correct (Number is the base class for all numeric values in Java) this was only coincidental. Using an higher-level type, such as Double, is more accurate and corresponds to the actual value being sent over the wire (in protobuf those properties are represented with double).

Same goes for Integer -> Long. Weaviate returns int64 values, which are best represented as Long in Java type system.

For consistency with the other clients, we follow the naming scheme of calling methods and types the way the data types are called in Weaviate ❗
For example, if I want to get the value of "percentageCarbs" for a group in the aggregation I might to do this:

Double pctCarbs = result.groups(0).groupedBy().number() // "number" is the collection property type 

which will return Double, because that's the underlying Java type.

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